“He who recites three times every morning and evening:`Bismillahil-ladhi la yadurru ma`as-mihi shai’un fil-ardi wa la fis-sama’i, wa Huwas-Sami`ul-`Alim(In the Name of Allah with Whose Name there is protection against every kind of harm in the earth or in the heaven, and He is the All-Hearing and All-Knowing),
nothing will harm him.”
[Abu Dawud and At-Tirmidhi]